saltwater mixing

Good afternoon, I’m setting up my WaterBox 25 peninsula bare bottom aquarium. Please hit me with all Constructive criticism you got... here we go: •Pumped out 25 gallons of water through my BRS 5 stage RO/DI (measured using a food safe bucket which then goes into a 32 gallon brute for mixing)...

Is it ok to put in RODI Water first then adding the salt into the tank with two powerheads then adding the live sand once the salt has been mixed and finally the PVC Pipe? I’m stuck with RODI water in 8 five gallon buckets with lids so just trying to figure out which way would be better